I guess I got a little excited about finding some info, sorry for the bad grammer. I should have stated that the number for the bolt was on the handle and the trigger comes off with the trigger guard. Upon further inspection and looking at photos of other ones posted here that instead of saying No4Mk11 it might be No4Mk1 and the start of a bracket around the letter F, the pencil marks are pretty faint. When I figure out how to post photos I will. I guess what I am looking for is the year it was made and where it was made and any other info that comes from these markings. Like I said I am new to this, I haven't had a chance to look elsewhere on this website but I am looking forward to it. Once again thanks for the info.